Aku Ankka

Aku Ankka

Lives in Cocos (Keeling) Islands Cocos (Keeling) Islands
Joined on Dec 28, 2010

Aku Ankka's recent activity

  • Replied in Why?
    No idea why test with radically different focal lengths, thus radicallty different images. Makes little sense to me.
  • digi2ap wrote: Certainly the colour balance is different. I'm immediately struck by the Sony's deep and vibrant blue and green hues, which I dislike. You do realize that you don't have to shoot...
  • Replied in Misconceptions
    Kendall Helmstetter Gelner wrote: Roland Karlsson wrote: MarkWW wrote: <...> Yes, this was once tested by Bob NL. To me - this is the major proof that Sigma has color problems. As opposed to...
  • Replied in New PDR value
    richard stone wrote: The idea in the Bayer sensors (as I understand it, and in general terms) is that the "green" filtered pixels are used to give detail, and there are more of them than any other...
  • bclaff wrote: When talking about exposure you have to somewhat careful. Exposure is normally the amount of light that hits the sensor What Akku means is that it is exposure time and aperture that...
  • bclaff wrote: No. ISO is not part of exposure parameters. Light, f-number and shutter speed are. Sorry but ISO ("film speed") is most definitely part of the exposure equation. No, it is not -...
  • rhlpetrus wrote: Roland Karlsson wrote: bclaff wrote: So … how can then the DR change with ISO? It should be constant. You're right. Only one value is measured and for comparison purposes the...
  • bwana wrote: Interestingly, when I made the dp3merrill images for bill, the instructions were to create different exposures using different shutter speeds. This is different than the standard...
  • rhlpetrus wrote: bclaff wrote: I have a recompute value of 8.62; this is based on the "green" plane.The "red" plane is typically a little higher.The "blue" is quite variable, sometimes much...
  • Kendall Helmstetter Gelner wrote: Aku Ankka wrote: <...> Both I and Bill have measured the DR. We used independent data sources as well. Yet our results are awfully similar. Both of us have also...
  • Replied in Good point.
    dmaclau wrote: Determine ground rules. Is this discussion about the electrical characteristics of the sensor? If so then the resulting image doesn't enter into the equation at all. Yes and you're...
  • Roland Karlsson wrote: Thanks for your answer. I think I have got it now. Sigma have made a unique decision. At least I think it is unique. Do you know if any other camera have done the same? The...
  • Scottelly wrote: Aku Ankka wrote: As some may recall, a long time ago I made my own measurements of Merrill sensor performance. I am not sure if I considered one point earlier though. My...
  • Replied in Film DR
    Oldwino wrote: Aku Ankka wrote: It is just one part, for some situations important, for many not - color film was perfectly fine inspite of being limited in it's DR. Out of curiosity, and maybe...
  • SigmaChrome wrote: Aku Ankka wrote: Quattro will have slightly less read noise simply due to having fewer photodiodes and there may be slight improvements elsewhere too, so the DR will be slightly...
  • Roland Karlsson wrote: I have looked at the graph. And I have read some of the posts, and now I am confused. This is what I see. Akku Anka says he got 11.5 or so in DR. I think he calls it...
  • Kendall Helmstetter Gelner wrote: Aku Ankka wrote: Kendall Helmstetter Gelner wrote: bclaff wrote: For example, if you have a file with totally black shadows but the highlights are blown also,...
  • Kendall Helmstetter Gelner wrote: bclaff wrote: For example, if you have a file with totally black shadows but the highlights are blown also, if you recover two stops of highlight data you now...
  • As some may recall, a long time ago I made my own measurements of Merrill sensor performance. I am not sure if I considered one point earlier though. My engineering-DR was between 11.9 and 12.2...
  • What about light? If you shoot single photons to a target aiming at a single exact spot, will the all hit the same exact spot, or will they spread randomly over an area? If they spread, does this...
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